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Physics 2007 PNEB (PUNTLAND NATIONAL EXAMINATION BOARD)
- 1. Name ............................................................. School ..................................………………… Roll Number.........................…………………. Puntland State of Somalia Ministry of Education Puntland National Examination Board Form 4 PHYSICS Examination 2007 Time 2 hours Plus 10 minutes before the exam for reading through the paper TOTAL TIME 2 hours 10 minutes INSTRUCTIONS TO CANDIDATES This paper consists of 15 printed pages. Count them now. Inform the invigilator if there are any missing. PART ONE ( 10 Multiple choice questions): 10 marks PART TWO ( 7 Structured questions): 90 marks TOTAL 100 marks • Answer ALL questions. • All answers and working must be written on this paper in the spaces provided immediately after each question. • Rough work can be done on page 2. This will not be marked • No extra paper is allowed. • No calculators are allowed. • If you make a mistake cross out the incorrect answer clearly and write your correct answer.
- 2. Puntland State of Somalia Secondary School Form Four Examination Puntland Certificate of Education Physics Examination June 2007 © PNEB 20072 Use This Page for Rough Work, It Will Not Be Marked …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… ………………………………….……………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… ………………………………….……………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… ………………………………….……………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… ………………………………….………………………………………………………………………
- 3. Puntland State of Somalia Secondary School Form Four Examination Puntland Certificate of Education Physics Examination June 2007 © PNEB 20073 1. From the figure, what is the angle of incidence? A . 37 0 B. 63 0 C. 53 0 D. 90 0 2. The diagram shows an electrical device. What is this electrical device? A. Transformer B. Electric bell C. D.C motor D. A.C generator 3. The figure shows a shovel scooping soil. What is the force required to lift the soil? A 15 N B. 30 N C. 7.5 N D. 45 N
- 4. Puntland State of Somalia Secondary School Form Four Examination Puntland Certificate of Education Physics Examination June 2007 © PNEB 20074 4. The figure shows a wave approaching a small opening. This is an illustration of wave 5. The graph shows how the velocity of a car changes over time. What is the average speed in m/s for the whole journey? 6. The figure shows a temperature recorded on a thermometer. What is the correct reading of the temperature? A. 50 0 C B. 55 0 C C. 60 0 C D. 65 0 C 7. Which of the following best describes a SOLID? A. Fills container, takes shape of container, flows easily, low density B. Definite volume, definite shape, does not readily flow, high density C. Definite volume, takes shape of container, flows easily, high density D. Fills container, definite shape, does not readily flow, low density A. reflection B. diffraction C. refraction D interference A. 20 B. 24 C. 900 D. 600
- 5. Puntland State of Somalia Secondary School Form Four Examination Puntland Certificate of Education Physics Examination June 2007 © PNEB 20075 8. Which of the following circuits correctly illustrates the arrangement of an ammeter and a voltmeter in a circuit designed to measure current and voltage in a lamp? 9. The figure shows a three pin plug in a domestic wiring system. Which of the following correctly illustrate the correct wire connection? 10. Which is the correct mirror image of the given letter F? The wire to pin Y is The wire to pin Z is A live brown or red B earth yellow /green C neutral brown or red D earth brown or red X Y Z
- 6. Puntland State of Somalia Secondary School Form Four Examination Puntland Certificate of Education Physics Examination June 2007 © PNEB 20076 PART 2: ( 90 marks) Answer all questions Question 1 1. A) State the laws of reflection. i)……………………………………………………………………………………………………….(2) ………………………………………………………………………………………………………….. ii)………………………………………………………………………………………………………… ……………………………………………………………………………………………………….. (2) B) The figure below illustrates the formation of an image in a pinhole camera. i) State two properties of an image formed in a pinhole camera. a) …………………………………………………………………………………………………..(1) b) …………………………………………………………………………………………………. (1) ii). State the effect of the image on the pinhole camera if the a). size of the pinhole is increased …………………………………………………………………………………………………………… ……………………………………………………………………………………………………… (1) b). pinhole is moved away from the object. ..………………………………………………………………………………………………………… ………………………………………………………………………………………………………….. …………………………………………………………………………………………………………(1)
- 7. Puntland State of Somalia Secondary School Form Four Examination Puntland Certificate of Education Physics Examination June 2007 © PNEB 20077 C). Hassan stands 8 m from the opening of a pinhole camera. If Hassan is 1.2 m tall and the screen of the camera is 12 cm from the pinhole, calculate the height of his image. == )(tan )(tanIm )( )(Im 0 UpinholefromcedisObject Vpinholefromcedisage hheightObject hheightage ionMagnificat i ………………………………………………………………………………………………………… ………………………………………………………………………………………………………….. ..………………………………………………………………………………………………………… ………………………………………………………………………………………………………(3) D). The figure shows a defect of vision i) Briefly explain how the defect can be rectified …………………………………………………………………………………………………………… …………………………………………………………………………………………………………(2) Question 2 A) The figure shows the cross-section of a vacuum flask i) Name the defect …………………………………………………………… ………………………………………………………….(1) a) Label the parts A and C i) A ………………………………………………………………………………………….(1) ii) C ………………………………………………………………………………………… (1) b) What does an arrow B indicate? ...............................………………………………………………………………………...(2)
- 8. Puntland State of Somalia Secondary School Form Four Examination Puntland Certificate of Education Physics Examination June 2007 © PNEB 20078 B). Explain how the thermos flask stops loss of heat by i).conduction.............................……………………………………………………………… …………………………………………………………………………………………………(2) ii).convection.............................…………………………………………………………… ……………………………………………………………………………………………… (2) iii) radiation .............……………………………………………………………………….. …………………………………………………………………………………………………(2) C) The diagram below shows two bulbs A and B painted silver and black. Explain what happens at A, B, P and Q when the lamp is switched on in terms of heat transfers. …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… ………………………………………………………………………………………………………….. ……………………………………………………………………………………………………………. ………………………………………………………………………………………………………….. …………………………………………………………………………………………………………(3)
- 9. Puntland State of Somalia Secondary School Form Four Examination Puntland Certificate of Education Physics Examination June 2007 © PNEB 20079 Question 3 A) The diagram below represents an electric bell. B). a) Write four sentences to explain how the bell rings when the switch is closed …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… ……………………………………………………………………………………………………(3) b). State two changes which can be made to E to increase its magnetism. i) ………………………………………………………………………………………………………… ii) …………………………………………………………………………………………………(2) C) An experiment is illustrated below. What result and conclusion should we expect from the experiment? …………………………………………………………………………………………………………… …………………………………………………………………………………………………………(2) a). Name the parts; i) C ………………………………………………(1) ii) D ………………………………………………(1) b). i) Identify a material suitable for E ……………………………………………… (1) ii) Explain why the material is suitable ………………………………………………………… ……………………………………………………(2)
- 10. Puntland State of Somalia Secondary School Form Four Examination Puntland Certificate of Education Physics Examination June 2007 © PNEB 200710 D). …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… ……………………………………………………………………………………………………… ( 3) Question 4 a) The figure below shows a wave profile. Use the graph to determine the: i) Amplitude……………………………………………………………………………(2) ii) Wavelength …………………………………………………………………………(2) If the speed of the wave is 10 m/s, what is the iii) Frequency of the wave ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………(2) iv) Period of the wave …………………………………………………………………….. ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………(2) A ship sends a signal in the ocean and an echo is heard after 6 seconds. Determine the depth of the ocean if the speed of sound in water is 1440 m/s. Vertical distance in (cm)
- 11. Puntland State of Somalia Secondary School Form Four Examination Puntland Certificate of Education Physics Examination June 2007 © PNEB 200711 b). The diagrams A and B represent two types of wave motion carrying energy in the direction shown. i). Name the wave motions represented by A and B A …………………………………………………………………………………………….(1) B …………………………………………………………………………………………… (1). ii) Explain the main difference between the two types of waves. …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… ………………………………………………………………………………………………………(4) Question 5 a). The figure shows one way of using water in generating electricity A B Generator B A
- 12. Puntland State of Somalia Secondary School Form Four Examination Puntland Certificate of Education Physics Examination June 2007 © PNEB 200712 b). The diagram shows a model generator. The magnet rotates. Explain in four sentences and using the words, magnetic field, poles, electrons, attraction and repulsion, how the model generates electricity when the magnet rotates …………………………………………………………………………………………………… …………………………………………………………………………………………………… …………………………………………………………………………………………………… …………………………………………………………………………………………………… …………………………………………………………………………………………………… ………………………………………………………………………………………………( 5 ) c) The output from the generator is connected to a step-up transformer. The transformer is connected to transmission lines as shown below. i) What form of energy is stored in the water at A? ……………………………………………………………………………………(1) ii) What form of energy will the water have when it reaches B? …………………………………………………………………………………… (1)
- 13. Puntland State of Somalia Secondary School Form Four Examination Puntland Certificate of Education Physics Examination June 2007 © PNEB 200713 i) Explain why a step-up transformer is needed …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………(2) ii) The primary coil of a step-up transformer is connected to a 240 V a.c supply. The secondary with 10 000 turns delivers 8 000 V and a current of 0.000 3 A. Calculate the number of turns in the primary. …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… ……………………………………………………………………………………………………….. (3) Question 6 a) The diagram represents the particles in a closed cylinder of carbon dioxide. ii).The temperature of the gas in the cylinder is increased. Describe the effect this has on the movement of carbon dioxide particles. ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… …………………………………………………………………………………………………….(2) b) Explain the following observations: It is easier to cut meat with a sharp knife than with a blunt one. …………………………………………………………………………………………………………… …………………………………………………………………………………………………………(2) Primary Secondary i) Describe how the particles of carbon dioxide exert pressure. ………………………………………………………………………… ………………………………………………………………………… ……………………………………………………………………(2)
- 14. Puntland State of Somalia Secondary School Form Four Examination Puntland Certificate of Education Physics Examination June 2007 © PNEB 200714 c) The diagram below shows how forces are balanced by two pistons. d). A diver is 10 m below the surface of the water in the ocean. If the density of water is 1000 kgm -3 …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… , determine the pressure on the diver. (Take g=10 N/kg) …………………………………………………………………………………………………………… ………………………………………………………………………………………………………..(3) Question 7 a) State two applications of electrostatics in everyday life. i)………………………………………………………………………………………………………… ………………………………………………………………………………………………………..(1) ii) ……………………………………………………………………………………………………… ………………………………………………………………………………………………………..(1) b) Explain why a glass window when wiped with a dry cloth on a dry day soon becomes dusty. …………………………………………………………………………………………………… ….. ……………………………………………………………………………………………………….(2) Calculate the force F exerted on the larger piston ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………(4)
- 15. Puntland State of Somalia Secondary School Form Four Examination Puntland Certificate of Education Physics Examination June 2007 © PNEB 200715 c) Three capacitors A,B and C are connected as shown. Calculate the: i) total capacitance in the circuit …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… ………………………………………………………………………………………………………..(3) ii). total charge in the circuit …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… ………………………………………………………………………………………………………..(2) END A = 3 µ F C = 4 µ F B= 6 µ F 50 V